Gas scrubber



June 8, 1937. K. K. NAHIGYAN 2,083,468

GAS SCRUBBER Filed Feb. '7, 1936 3 Sheets-Sheet l K1: V'ORK K. NAHJGYAN June 8, 1937.

KEVORK K. NAHIG YAN une 8, 1937. K. K. NAHIGYAN 2,083,468

GAS' SCRUBBER Filed Feb. 7, 1936 3 Sheets-Sheet 3 wucm/fom KHz/01w K AMHIG'YAN Patented June 8, 1937 UNITED STATES PATENT OFFICE GAS SCRUBBER Application February 7, 1936, Serial No. 62,794

6 Claims.

This invention relates to gas scrubbers, and more particularly to scrubbers of the wet type having deflecting members located in a gas passage and supplied with water or othersuitable liquid.

Apparatus of this type is frequently utilized for cleaning the flue gases discharged from steam boiler furnaces. Such gases usually contain oxides of sulphur, and these oxides are highly corrosive in the presence of moisture. As a result, deflecting members of the type heretofore constructed have had a comparatively short life. Attempts to solve the problem have been complicated by the fact that the gases entering the scrubber are at an elevated temperature. The water which flows over the deflecting members normally keeps them cool, but there is a possibility that the water supply might fail and under such circumstances the deflecting members would be subjected to comparatively high temperatures.

It is accordingly one object of the invention to provide a deflecting member for gas scrubbers of the wet type which will be free from difficulties caused by corrosion.

It is a further object of the invention to provide a deflecting member for gas scrubbers of the wet type which will operate satisfactorily with high temperature gases of a corrosive nature.

It is a further object of the invention to provide a deflecting member for gas scrubbers of the wet type which will be simple and'inexpensive to manufacture, and thoroughly reliable in operation.

5 With these and other objects in view, as will be apparent to those skilled in the art, the invention resides in the combination of parts set forth in the specification and covered by the claims appended hereto.

40 Referring to the drawings illustrating one embodiment of the invention, and in which like reference numerals indicate like parts,

Fig. 1 is a longitudinal section through a gas scrubber, the section being taken on the line l-l 45 of Fig. 2;

5 of spaced vertical wall structures formed of metal plates ll] lined with refractory material ll. As shown particularly in Fig. 2, the refractory material is interlocked with vertical T-shaped columns l2 which are secured to the plates I0 by means of angles l4. These wall structures from the opposite side walls of a horizontal gas passage E5. The bottom of this gas passage is formed by a metal tank or collecting basin l6 lined with refractory material l8 and provided with a suitable drain pipe l9. The upper wall of the gas passage I5 is formed in part by an upper tank constructed of cast iron or other suitable material and supported by four vertical columns 22 located outside of the gas passage. In front of and to the rear of the tank 20 are two horizontal wall structures 23 constructed of metal lined with refractory material. These structures 23 are located slightly below the bottom of the tank 20, and they serve to complete the upper wall of the gas passage.

Gas is delivered to the passage it through an inlet duct 25, and the gas leaves the passage l5 through an outlet duct 26. The inlet duct 25 is arranged to receive the gas as it flows downwardly, and the outlet duct is arranged to discharge. the gas in an upward direction. Consequently the gas travels in a U-shaped path, which not only saves floor space but it also tends to separate the heavier particles of foreign matter from the gas by gravity and centrifugal action, and to deposit such particles in the lower tank It. To facilitate such deposit, the bottom walls of the ducts 25 and 26 are inclined downwardly toward the tank I6, and pipes 21 are provided to spray water on these inclined walls when desired to wash the particles into the tank. The ducts 25 and 26 areprovided with suitable doors '28 which allow access to the interior of the scrubber.

Deflecting members in plates 30 are provided in the passage l5, these plates being arranged in five transverse rows. The plates 30 are inclined at approximately 45 degrees to the general direction of flow of the gas, and the plates of adjacent rows are inclined in opposite directions, thus forming a series of zig-zag passages for the gas, as shown particularly in Fig. 2.

Water is supplied to the surfaces of the plates 30, and for this purpose a receptacle 3! is formed at the upper end of each plate. Each receptacle is open at the top, and its bottom wall is provided with several openings 32 through which Water may flow downwardly to the opposite sides of the platetherebeneath and spread over the plate in a thin film. The plates are formed with vertical ribs 34 which prevent the water from the form of vertical being swept from the plates by the action of the gas stream. Water is supplied to the upper tank 20 through a pipe 35, and this water is distributed among the receptacles 3| by means of metering devices in the form of vertical tubes 36 (Fig. 3) of the type disclosed in my prior application Se- ,rial No. 735,444, filed July 16, 1934 (since issued as U. S. Patent 2,048,403, dated July 21, 1936.

The tubes 33 are open at the top and provided with vertically spaced openings 38 in their sides,

the. lower ends of the tubes being mounted in plates 39. These plates are surrounded by gaskets 40 and inserted in openings 4| in the bottom wall of the tank and directly above the receptacles 3|. i

The deflecting plates 30 rest by gravity on the bottom wall of the lower tank I6, and each plate is preferably formed with anenlarged base or block 43 at its lower end. Bricks 44 (Fig. 2) may be placed between adjacent blocks 43 to maintain them in the desired positions. The plates are supported laterally at the, top by means of lugs45 (Fig. .3) which project downwardly from the bottom-of the upper tank 20 into the receptacles-3|. These lugs are curved on their outer surfaces to facilitate assembly of the various parts. It will be understood that when mounting a'plate 3|! inthe passage |5, the erector will hold theplate at an angle with the vertical and bring thereceptacle 3| 'at the upper end of the plate into engagement with the lugs 45, whereupon the lower endof the plate can be swunginto position. The deflecting plates 30 are subjected to water and sulphurous gases at comparatively high tem- 1 peratures, and if the water supply should fail the temperature would rise still higher. In order to enable theplates to' withstand these'conditions they are preferably constructed of a ceramic ma- .terial, such as baked fireclay. Except for the receptacles 3| and the blocks 43, the plates are made of a uniform cross-section from top to bot- 'tom.'- This makes it possible to formthe plates by extruding the .clay' while in a plastic condition through a suitably shaped 'dieand thereafter baking the plates. Each plate is preferably made in handling.

"In order to hold the various parts of the plates in assembled relationship, each plate is provided at each edge with a longitudinal bead 41 having several sections to facilitate manufacture and a circular opening extending longitudinally therethrough and connecting at its ends with circular recesses 49 in the receptacle 3| and block 43. A metal rod 5| is mounted in each opening 48 jwithits ends extending into the recesses 43.

The ends of the rod-arescrew-threaded to re"- ceive nuts 52, and between the bottom of each recess and the corresponding nut there is proyided a plain washer 53 and a spring washer 54.

Thenuts 52 are preferablyadjustedto clamp the plate sections together firmly and yet not com pletely 'flatten the spring washers 54. .These washers will "then serve to compensate for any unequal'expansion between the refractory material and themetal rod. After adjustment of the nuts 52, the recesses 49 are preferably filled with refractory material 56, which may be applied in plastic form. v

The'operation of the invention will now be apparent fromtheabove disclosure. Water enters the upper tank Zll'from the pipe 35, and flows through the openings 38 into the receptacles 3|. The'water escapes from the receptacles through theopenings 32 and flows downwardly over the surfaces of the plates 30 in thin films Dustladengases enter the passage l5 from the inlet duct 25, and after flowing among the plates 30 they escape through the outlet duct 26. The dust particles carried by the gases are retained by the water fllms and washed downwardly into the tank will have a comparatively long life.

ceramic plates 30 will remain free from corrosion.

the parts in assembled relationship.

' spring between one of the abutments and the bot- 2,oss,4ea r lower tank It, whence they escape through the outlet pipe IS. The receptacles 3| fill the space I immediately below the upper tank Zli-rather completely, as shown in Fig, 3, and the wall structures 23 extend downwardly below the tank- As a result very little of the flowing gas will flnd its way into contact with the upper tank, and the The and they are capable of withstanding relatively high temperatures occasioned by possible failure of the water supply. These plates are compara-- tively simple and inexpensive to manufacture. The metal rods 5| are completely enclosed inthe. ceramic material and hence thoroughlyprotected from corrosion. f r

Having thus described my invention, whatfI' claim as new and desire to secure by I Letters Patent is: I I

1. A deflecting member for, gas scrubbersconiprising an upright plate having an opening ex-.

tending throughout substantially the entire length thereof, a receptacle at the upper endof.

the plate, the receptacle having an opening aligned with the opening in the plate, and a rod 7 end of the plate, a base at thelower end of the plate, said plate, receptacle and base having aligned openings and the receptacle and base having recesses communicating with the openings, a rod extending through the openings, and abutments on the rod located in the recesses. v i

4. A deflecting member for gas scrubbers comprising an upright plate, a receptacle at the upper endof the plate, a base 'at the lower end of the plate, said plate, receptacle and base having aligned openings and the receptacle and base having recesses communicating with the openings, a rod extending through the openings, abut ments on, the'rod locatedin the recesses, and 9.

tom of the corresponding recess. r

5. A. deflecting member forgas scrubbers com,- prising an upright plate divided horizontally into sections, a bead extending along each edge of the plate and provided with a longitudinal opening therethrough, and rods extending throughFthe openings to maintain the sections in assembled) relationship.v r

6. A deflecting member forgas scrubbers comprising an upright plate, a bead extending along each edge of the plate and provided with a longi tudinal opening therethrough, a receptacle at the upperend of the plate, a base at the lower end of the plate, the receptacle and base havingopenings therein aligned with said longitudinal open ings, and rods extending through'the openings to hold the parts in assembled relationship. 4 j

KEvoa KQNAHIGYANLJV 

